Answer: Oleanders have toxins in their leaves, stems, wood and roots. I'd dig them up, roots and all to remove the toxins from the area. Failing that you'll be forever dealing with suckering growth from the roots when you replant in the area and the roots receive moisture. I know it will be a huge labor intensive process, but total eradication is your best course of action. After you've removed them from the landscape you can safely plant veggies and other plants in the area. Good luck with your project.
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